This week on Our Changing World, Scion is finding out if an introduced parasitic wasp could be a biocontrol agent for a pest of eucalpytus trees, and GNS Science is investigating how fossil pollen can tell us about lost worlds.

The parasitic wasp Eadya paropsidis comes from Tasmania, and lays its eggs in the larvae of the eucalypt tortoise beelte. Photo: RNZ / Alison Ballance